This year’s Republican and Democratic national conventions will have their own distinct brands of banners, nametags and rhetoric. But they are expected to generate similar traffic jams.

To help politicians and visitors get around more easily, healthcare company Humana Inc. is supplying 20 “bus-cycles” for the Republican gathering this week in Tampa, Fla., and next week’s Democratic convention in Charlotte, N.C. The vehicles are powered only by the pedaling of its passengers. They carry as many as eight people.

The pedal-powered four-wheelers can drive through narrow spaces, across plazas and in other areas where cars cannot go.